GMC Vandura P3500 (1985-1997) service engine soon indicator Wiring diagrams

1-2 SHIFT SOL 1-2 SHIFT SOLENOID 2-3 SHIFT SOL 2-3 SHIFT SOLENOID A/T INPUT SPEED SENSOR (LEFT SIDE OF TRANSMISSION) A/T ISS HI IN A/T ISS LO IN ACCESSORY POWER POINT AUTOMATIC TRANSMISSION BATTERY IN BLK WIRE BLK/WHT WIRE BRAKE SWITCH INPUT BRN WIRE BRN/WHT WIRE DASH FUSE BLOCK TRANS FUSE DATA CLASS II DK BLU WIRE DK BLU/WHT WIRE ECM BATT FUSE ECM I FUSE ECT SENS INPUT ELECTRONIC BRAKE CONTROL MODULE ENG 1 FUSE ENGINE COOLANT TEMPERATURE SENSOR (TOP FRONT OF ENGINE) FUEL INJECTORS (ENIGINE CONTROLS SYSYTEM) FUEL PUMP RELAY, FUEL PUMP SWITCH/ENGINE OIL PRESSURE GAUGE SENSOR GAUGES FUSE GRY WIRE HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START I-3 FUSE IGNITION IN INSTRUMENT CLUSTER LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE MIL CONTROL ORG/ WIRE PCM GROUND PCS SOL HI OUT PCS SOL LO OUT PNK WIRE PPL PPL DATA LINK CONNECTOR (PARTIAL) (BELOW DASH NEAR STEERING COLUMN) PPL/WHT WIRE PRESS CTRL SOLENOID RANGE SIGNAL "A" RANGE SIGNAL "B" RANGE SIGNAL "C" RED WIRE RED/BLK WIRE SENSOR GROUND SENSOR RETURN SERVICE ENGINE SOON INDICATOR TCC PWM SOL TCC PWM SOLENOID TCC/STOP- LAMP SWITCH (ON BRAKE PEDAL BRACKET) THROTTLE POSITION SENSOR (MOUNTED TO SIDE OF THROTTLE BODY) TP SENS INPUT TRANS FLUID TEMP SENSOR TRANS RANGE PRESSURE SWITCH ASSEMBLY TRANS TEMP SIG IN VEHICLE CONTROL MODULE (LEFT FRONT CORNER OF ENGINE COMPT) VEHICLE SPEED SENSOR (LEFT REAR OF TRANSMISSION) VSS HI VSS LO VSS SENSOR SHIELD YEL WIRE YEL/BLK WIRE

1-2 SHIFT SOL 1-2 SHIFT SOLENOID 2-3 SHIFT SOL 2-3 SHIFT SOLENOID A/T INPUT SPEED SENSOR (LEFT SIDE OF TRANSMISSION) A/T ISS HI IN A/T ISS LO IN ACCESSORY POWER POINT AUTOMATIC TRANSMISSION BATTERY IN BLK WIRE BLK/WHT WIRE BRAKE SWITCH INPUT BRN WIRE BRN/WHT WIRE DASH FUSE BLOCK TRANS FUSE DATA CLASS II DK BLU WIRE DK BLU/WHT WIRE ECM BATT FUSE ECM I FUSE ECT SENS INPUT ELECTRONIC BRAKE CONTROL MODULE ENG 1 FUSE ENGINE COOLANT TEMPERATURE SENSOR (TOP FRONT OF ENGINE) FUEL INJECTORS (ENIGINE CONTROLS SYSYTEM) FUEL PUMP RELAY, FUEL PUMP SWITCH/ENGINE OIL PRESSURE GAUGE SENSOR GAUGES FUSE GRY WIRE HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START I-3 FUSE IGNITION IN INSTRUMENT CLUSTER LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE MIL CONTROL ORG/ WIRE PCM GROUND PCS SOL HI OUT PCS SOL LO OUT PNK WIRE PPL PPL DATA LINK CONNECTOR (PARTIAL) (BELOW DASH NEAR STEERING COLUMN) PPL/WHT WIRE PRESS CTRL SOLENOID RANGE SIGNAL "A" RANGE SIGNAL "B" RANGE SIGNAL "C" RED WIRE RED/BLK WIRE SENSOR GROUND SENSOR RETURN SERVICE ENGINE SOON INDICATOR TCC PWM SOL TCC PWM SOLENOID TCC/STOP- LAMP SWITCH (ON BRAKE PEDAL BRACKET) THROTTLE POSITION SENSOR (MOUNTED TO SIDE OF THROTTLE BODY) TP SENS INPUT TRANS FLUID TEMP SENSOR TRANS RANGE PRESSURE SWITCH ASSEMBLY TRANS TEMP SIG IN VEHICLE CONTROL MODULE (LEFT FRONT CORNER OF ENGINE COMPT) VEHICLE SPEED SENSOR (LEFT REAR OF TRANSMISSION) VSS HI VSS LO VSS SENSOR SHIELD YEL WIRE YEL/BLK WIRE

1-2 SHIFT SOL 1-2 SHIFT SOLENOID 2-3 SHIFT SOL PPL CLASS II DATA PNK IGNITION IN PNK IGNITION IN WIRE 2-3 SHIFT SOLENOID 3-2 SHIFT SOL 3-2 SHIFT SOLENOID A/C COMPRESSOR RELAY, GENERATOR PNK WIRE A/T INPUT SPEED SENSOR (LEFT SIDE OF TRANSMISSION) A/T ISS SENS HI IN A/T ISS SENS LO IN ACCELERATOR PEDAL POSITION MODULE (ATTACHED TO ACCELERATOR PEDAL) ANTI-LOCK BRAKES APP 1 SIGNAL IN APP 3 SIGNAL IN AUTOMATIC TRANSMISSION BATTERY IN BLK WIRE BRN WIRE BRN/WHT WIRE BUSS BAR CRUISE CONTROL SYSTEMS DASH FUSE BLOCK DATA LINK CONNECTOR (PARTIAL) (BELOW DASH, NEAR STEERING COLUMN) DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE ECM 1 FUSE ECM BAT FUSE ECT SENSOR IN ENGINE COOLANT TEMPERATURE SENSOR (TOP FRONT OF ENGINE) FUEL INJECTORS (ENGINE CONTROLS) FUEL PUMP RELAY, SWITCH GAUGES FUSE GRY WIRE HAZARD LAMPS FLASHER (ABOVE STEERING COLUMN) HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START I-3 FUSE INSTRUMENT CLUSTER LT BLU WIRE LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE MIL CONTROL ORG/ WIRE PCM GROUND PCS SOL HI OUT PCS SOL LO OUT PNK WIRE POWERTRAIN CONTROL MODULE (BEHIND LEFT SIDE OF DASH) PPL PPL APP 2 SIGNAL IN PPL/WHT WIRE PRESS CTRL SOLENOID RED WIRE RED/BLK WIRE SENSOR GROUND SERVICE ENGINE SOON INDICATOR STOP LAMPS, TORQUE CONVERTER BRAKE SWITCH STOP/ HAZ FUSE STOPLAMP SWITCH IN TFT SENSOR IN TRANS FLUID TEMP SENSOR TRANS FUSE TRANS RANGE "B" PNK TRANS RANGE "A" PPL BRAKE SWITCH IN WIRE TRANS RANGE "C" TRANS RANGE PRESSURE SWITCH ASSEMBLY VEHICLE SPEED SENSOR (LEFT REAR OF TRANSMISSION) VEHICLE SPEED SENSOR BUFFER (ABOVE ACCELERATOR PEDAL) VSS HI IN VSS LO IN VSS LO IN PPL SENSOR GROUND VSS OUT YEL WIRE YEL/BLK WIRE

1-2 SHIFT SOL 1-2 SHIFT SOLENOID 2-3 SHIFT SOL 2-3 SHIFT SOLENOID A/C COMPRESSOR RELAY, GENERATOR, SEAT BELT/ HEADLAMP ALARM MODULE A/T INPUT SPEED SENSOR (LEFT SIDE OF TRANSMISSION) A/T ISS HI IN A/T ISS LO IN A/T OUTPUT SPEED SENSOR AUTOMATIC TRANSMISSION BATTERY IN BLK WIRE BRAKE SWITCH INPUT BRN WIRE BRN/WHT WIRE BUSS BAR COOLING FANS, ENGINE CONTROLS SYSTEMS CRUISE CONTROL MODULE, SWITCH DASH FUSE BLOCK DATA CLASS II DK BLU WIRE DK BLU/WHT WIRE ECM 1 FUSE ECM BAT FUSE ECT SENS INPUT ENG 1 FUSE FUEL INJECTORS (ENGINE CONTROLS SYSTEM) FUEL PUMP RELAY, SWITCH GAUGES FUSE GRY WIRE HOT AT ALL TIMES HOT IN RUN HOT IN RUN OR START I-3 FUSE IGNITION IN INSTRUMENT CLUSTER LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE MIL CONTROL ORG/ WIRE PCM GROUND PCS SOL HI OUT PCS SOL LO OUT PNK WIRE PPL PPL DATA LINK CONNECTOR (PARTIAL) (BELOW DASH NEAR STEERING COLUMN) PPL/WHT WIRE PRESS CTRL SOLENOID RANGE SIGNAL "A" RANGE SIGNAL "B" RANGE SIGNAL "C" RED WIRE RED/BLK WIRE SENSOR GROUND SENSOR RETURN SERVICE ENGINE SOON INDICATOR STOP LAMPS, TORQUE CONVERTER CLUTCH SWITCH TCC PWM SOL TCC PWM SOLENOID TP SENS INPUT TRANS FLUID TEMP SENSOR TRANS FUSE TRANS RANGE PRESSURE SWITCH ASSEMBLY TRANS TEMP SIG IN TWISTED WIRE PAIR VEHICLE CONTROL MODULE (CENTER FRONT OF ENGINE COMPT) VEHICLE SPEED SENSOR (LEFT REAR OF TRANSMISSION) VSS HI VSS LO YEL WIRE YEL/BLK WIRE

2-3 SHIFT SOL A/T INPUT SPEED SENSOR (LEFT SIDE OF TRANSMISSION) ANTI-LOCK BRAKES AUTOMATIC TRANSMISSION BLK WIRE BRN WIRE BRN/WHT WIRE BUSS BAR CRUISE CONTROL SYSTEMS DASH FUSE BLOCK DATA LINK CONNECTOR (PARTIAL) (BELOW DASH, NEAR STEERING COLUMN) DK BLU WIRE DK BLU/WHT WIRE ECM BAT FUSE ECM I FUSE ENGINE CONTROLS SYSTEMS ENGINE COOLANT TEMPERATURE SENSOR (TOP FRONT OF ENGINE) FUEL INJECTORS (ENGINE CONTROLS) FUEL PUMP RELAY GAUGES FUSE GRY WIRE GRY/RED WIRE HOT AT ALL TIMES HOT IN HOT IN RUN OR START HOT IN RUN, BULB TEST OR START I-3 FUSE INSTRUMENT CLUSTER LT BLU/WHT WIRE LT GRN WIRE LT GRN/BLK WIRE ORG/ WIRE PNK IGNITION FEED WIRE PNK WIRE POWERTRAIN CONTROL MODULE (LEFT SIDE OF DASH) PPL PPL PNK WIRE PPL/WHT WIRE PRESSURE CONTROL SOL RANGE MODE SELECTOR RED WIRE RED/BLK WIRE RUN WIRE SERVICE ENGINE SOON INDICATOR STOP LAMPS, TORQUE CONVERTER BRAKE SWITCH SWITCH TAN WIRE TCC PWM SOL 1-2 SHIFT SOL THROTTLE POSITION SENSOR (ON SIDE OF THROTTLE BODY) TRANS FLUID TEMP SENSOR TRANS FUSE VEHICLE SPEED SENSOR (LEFT REAR SIDE OF TRANSMISSION) VEHICLE SPEED SENSOR BUFFER (ABOVE ACCELERATOR PEDAL) WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

A/C COMPRESSOR HIGH PRESSURE CUT-OFF SWITCH (REAR OF A/C COMPRESSOR) A/T BLK WIRE BREAKOUT) BRN WIRE BRN/WHT WIRE DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENG-BAT FUSE FROM ECT SENSOR BREAKOUT) FROM TPS BREAKOUT) FUEL GAUGE FUEL PUMP SWITCH, ENGINE OIL PRESSURE GAUGE SENSOR (TOP LEFT REAR OF ENGINE) FUEL SENDER, FUEL PUMP (TOP OF FUEL TANK) GAUGES FUSE GROUND DISTRIBUTION SYSTEM GRY WIRE HOT AT ALL TIMES HOT IN (ON) RUN, START (CRANK) I/P FUSE BLOCK (DASH PANEL PROVIDED BY BODY BUILDER) (BODY BUILDER INSTALLED) INSTRUMENT CLUSTER LT BLU/WHT WIRE LT GRN WIRE M/T MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR (INTAKE MANIFOLD, REAR CENTER) MAP REF LO MASS AIR FLOW SENSOR (MAF) (AIR INTAKE SYSTEM BETWEEN AIR CLEANER, ENGINE) NCA WIRE OIL PRESS GAUGE ORG/ WIRE PNK PNK 2 3 4 5 6 7 8 9 WIRE PNK PNK PNK 2 3 4 5 WIRE PNK PNK WIRE PNK WIRE PPL RED WIRE RED/BLK WIRE REF LO TEMP REF THROTTLE POSITION (TP) SENSOR (INTAKE SYSTEM, LEFT SIDE) SENSOR BREAKOUT) SERVICE ENGINE SOON INDICATOR SPEEDO- METER TAN WIRE WHT WIRE YEL WIRE

A/C COMPRESSOR HIGH PRESSURE CUT-OFF SWITCH (REAR OF A/C COMPRESSOR) BLK WIRE BREAKOUT) BRN WIRE BRN/WHT WIRE DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENG-BAT FUSE FROM ECT SENSOR BREAKOUT) FROM MAF SENSOR BREAKOUT) FROM TP SENSOR BREAKOUT) FUEL PUMP SWITCH, ENGINE OIL PRESSURE GAUGE SENSOR (TOP LEFT REAR OF ENGINE) FUEL SENDER, FUEL PUMP (TOP OF FUEL TANK) GAUGES FUSE GRY WIRE HOT AT ALL TIMES HOT IN (ON) RUN, START (CRANK) I/P FUSE BLOCK (DASH PANEL PROVIDED BY BODY BUILDER) (BODY BUILDER INSTALLED) INSTRUMENT CLUSTER LT BLU/WHT WIRE LT GRN WIRE M/T A/T MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR (INTAKE MANIFOLD, REAR CENTER) MAP MASS AIR FLOW (MAF) SENSOR (AIR INTAKE SYSTEM BETWEEN AIR CLEANER, ENGINE) NCA WIRE OIL PRESS GAUGE FUEL GAUGE ORG/ WIRE PNK 5 6 7 WIRE PNK PNK PNK PNK 1 2 3 4 WIRE PNK PNK WIRE PNK WIRE PPL RED WIRE RED/BLK WIRE REF LO REF LO TEMP REF THROTTLE POSITION (TP) SENSOR (INTAKE SYSTEM, LEFT SIDE) SERVICE ENGINE SOON INDICATOR SPEEDO- METER TAN WIRE TRANS FUSE WHT WIRE YEL WIRE

"GLOW PLUGS" INDICATOR 17 18 PNK WIRE 7 8 9 10 11 PNK PNK WIRE A/C COMPRESSOR CONTROL RELAY (RIGHT SIDE OF DRIVER'S ISLAND) A/C HIGH PRESSURE CUT-OFF SWITCH (ON REAR OF THE A/C COMPRESSOR) BLK WIRE BREAKOUT FOR FUEL PUMP RELAY TOWARD ENGINE) BRN WIRE BRN/WHT WIRE DK BLU WIRE DK BLU/WHT WIRE DK GRN WIRE DK GRN/WHT WIRE ECM BAT FUSE ENG-BAT FUSE FROM PCM CONNS FROM SINGLE WIRE CONN ON GLOWPLUG CONTROLLER) FUEL LIFT PUMP (INSIDE LEFT FRAME RAIL, BELOW DRIVER'S DOOR) FUEL PUMP OIL PRESSURE INDICATOR SWITCH (LEFT REAR OF ENGINE) FUEL PUMP RELAY (IN UNDERHOOD FUSE-RELAY CENTER) GAUGES FUSE GRN WIRE GRY WIRE HOT AT ALL TIMES HOT IN RUN, START (CRANK) I/P FUSE BLOCK (MOUNTED ON THE I/P) IN LINE TO FUEL PUMP PRIME (PLANT USE) INSTRUMENT CLUSTER LEFT BULKHEAD GROMMET) LT GRN WIRE NCA WIRE OIL PRESS GAUGE ORG/ WIRE PNK WIRE RED WIRE SERVICE ENGINE SOON INDICATOR SERVICE THROTTLE SOON INDICATOR SPEED METER TAN WIRE WAIT TO WATER IN FUEL INDICATOR WATER IN-FUEL INDICATOR SENSOR (PART OF FUEL INJECTION PUMP) WATER IN-FUEL INPUT WHT WIRE WHT/BLK WIRE YEL WIRE YEL/BLK WIRE

A/C HIGH PRESSURE CUT-OFF SWITCH (ON REAR OF THE A/C COMPRESSOR) BLK WIRE BLK/WHT WIRE BREAKOUT FOR CRUISE CONTROL MODULE, TOWARD RELAYS) BREAKOUT FOR CRUISE CONTROL MODULE, TOWARD VCM) BREAKOUT FOR GENERATOR, TOWARD CRUISE CONTROL MODULE) BREAKOUT FOR LEFT FRONT WHEEL SPEED SENSOR, TOWARD ENG) BRN WIRE BRN/WHT WIRE DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ENG-BAT FUSE FUEL GAUGE FUEL PUMP, SENDER (ON TOP OF FUEL TANK) FUEL PUMP/ OIL PRESSURE SWITCH (ON ENGINE BLOCK, TOP REAR, BEHIND DISTRIBUTOR) GAUGES FUSE GROUND DISTRIBUTION SYSTEM GRY WIRE HOT AT ALL TIMES HOT IN RUN OR START (CRANK) I/P FUSE BLOCK (MOUNTED ON THE I/P) INSTRUMENT CLUSTER LT BLU/WHT WIRE LT GRN WIRE MASS AIR FLOW SENSOR (MOUNTED IN FRESH AIR INTAKE BEHIND AIR FILTER BOX) NCA WIRE OIL PRESS GAUGE ORG/ WIRE PNK PNK 1 2 3 4 WIRE PNK PNK 2 3 WIRE PNK WIRE PPL RED WIRE RED/BLK WIRE SERVICE ENGINE SOON INDICATOR SPEED METER TAN WIRE THROTTLE POSITION SENSOR (ON RIGHT SIDE OF INTAKE PLENUM AT THROTTLE INTAKE) TRANS FUSE WHT WIRE YEL WIRE

BATTERY JUNCTION BLOCK (ON FORWARD LEFT SIDE OF BULKHEAD) BLK WIRE BLK/RED WIRE BRN WIRE BRN/WHT WIRE BYPASS DIST. REF HI DIST. REF LO DISTRIBUTOR DK BLU WIRE DK GRN WIRE DK GRN/WHT WIRE ECM 1 FUSE FUEL GAUGE FUEL PUMP PRIME CONNECTOR FUEL PUMP RELAY (AT RELAY CENTER RIGHT SIDE OF MAIN SUPPORT AT DRIVER'S ISLAND) FUEL PUMP, SENDER (ON TOP OF FUEL TANK) FUSIBLE LINK (16 GA- GAUGES FUSE GRY WIRE HIGH VOLTAGE IGNITION COIL WIRE HOT AT ALL TIMES HOT IN RUN, START (CRANK) I/P FUSE BLOCK (MOUNTED ON THE I/P) IGNITION COIL (ON BRACKET AT REAR OF INTAKE PLENUM) IGNITION MODULE IGNITION SWITCH INSTRUMENT CLUSTER LOCK OFF OIL PRESS GAUGE ORG/ WIRE PICKUP COIL PNK 9 10 11 12 13 14 15 16 WIRE PNK PNK 1 2 3 4 5 WIRE PNK WIRE PPL PPL/WHT WIRE RED WIRE RUN WIRE SERVICE ENGINE SOON INDICATOR SPEED METER TACHOMETER TEST LEAD TAN WIRE TAN/BLK WIRE THROTTLE BODY FUEL INJECTOR NO.1 (ON TOP OF INTAKE MANIFOLD) THROTTLE BODY FUEL INJECTOR NO.2 (ON TOP OF INTAKE MANIFOLD) WHT WIRE